Convert backslashes to slashes on windows for path inputs.
Convert backslashes to slashes on windows for path inputs.

This applies only to interactive use, using this as a library should
still use generic /-delimited strings.

Fixes PR 11619 -- hopefully.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket